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IS 781 (1984) : Cast Copper Alloy Screw Down Bib Taps And
Stop Valves for Water Services [CED 3: Sanitary Appliances
and Water Fittings]

Jawaharlal Nehru
'Step Out From the Old to the New"

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PROTECTED BY COPYRIGHT

Indian Standard

IS t 781 . 1984

( Reaffirmed 2005 )

SPECIFICATION FOR CAST COPPER ALLOY

SCREW DOWN BIB TAPS AND STOP

VALVES FOR WATER SERVICES

( Third Revision )

Second Reprint OCTOBER 1991
UDC 621. 646. 5/. 6: [669. 35. 018. 28] :696. 117

® Co^right 1985

BUREAU OF INDIAN STANDARDS

MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

Gr5 Mareh 1985

IS : 781 - 1984

Indian Standard

SPECIFICATION FOR CAST COPPER ALLOY

SCREW DOWN BIB TAPS AND STOP

VALVES FOR WATER SERVICES

( Third Revision )

Sanitary Appliances and Water Fittings Sectional
Committee, BDC 3

Chairman JUpnsenting

Shbi K. D. MuIiSkab Municipal Corporation of Greater Bombay^

Bombay
M€mber$
Adviser ( PHE ) Central Public Health & Environments!

Engineering Organization ( Ministry of Works
& Housing ), New Delhi
Deputy Adviskb ( PHE ) ( Alternate )
Shbi S. K. Banebjbb National Test House, Calcutta

Shbi O. K. Kakukqo ( Alternate )
Shbi M. K. Basu Central Glass & Ceramic Research Institute

( CSIR ), Calcutta
Chief Enoinee^ Public Health Engineering Department,

Government of Kerala, Trivandrum
Shbi K. Ramachaitdeak ( Alternate }
Chief Enqikekb U. F. Jal Nigam, Lucknow

SuPEBiNTENDiKO EisGimssB ( Alternate )
Shbi J. D *Cbuz Municipal Corporation of Delhi, Delhi

Shbi S. A. Swaacy ( Altgrjtate }
DiBEGTOB Bombay Potteries & Tiles Ltd, Bombay

Shbi B. R. N. Gupta Engineer-in-Chief 's Branch, Army Headquarters,

New Delhi
Shbi K, V. Kbishkamubtby
( Alternate )
Shbi P. Jaoanath Rao EID-Parry (India ) Ltd, Madras

Shbi M. Moosa Sulaixan ( Alternate )
Shbi A. F. Khan Municipal Corporation of Greater Bombay,

B<mibay
Deputy Hydbaulio Enoimeeb
( Alternate )

{CtfUinmd 0H pa^ 2 )

BUREAU OF INDIAN STANDARDS

This publication is protected under the Indian Copyright Act (XIV of 1957) and

reproduction in whole or in part by any means exc^t with written permission of the

publisher shall be deemed to be an infringement of copyright under the said Act.

IS: 781 -1984

( Continued from page 1 )

Members Ripresenting

Shbi S. R. KsHiRSAOAB National Environmental Engineering Research

Institute ( CSIR ), Nagpur
Shbi R. G. Reddy ( Alternate )
Shbi K. LAKSHMmARAYAKAN Hindustan Shipyard Ltd, Vishakhapatnam

Shbi A. Sharifi* ( Alternate )
Db a. V. R. Rao National Buildings Organization ( Ministry of

Works and Housing ), New Delhi
Shbi J. Sunoupta ( Alternate )
Sbsniob Civil Enoinbkb ( Wateb Railway Board, New Delhi

Supply )
Shbi S. K. Shabma Central Building Research Institute ( CSIR ),

Roorkee
Shbi R. K. Sohany Hindustan Sanitaryware & Industries Ltd,

Bahadurgarh
SuRVKYOB OP Works ( NDZ ) Central Public Works Department, New Delhi

SlTBVBYOR OP W0BK8 I ( ND2 )
( Alternate )
Shbi R. Thanjan Directorate General of Technical Development,

New Delhi
Shbi M. M. Alikhak ( Alternate )
Shbi T. N. Ubovkja Directorate General of Supplies & Disposals,

New Delhi
Shbi G. Rahan, Director General, ISI ( Ex-officio Member)

Director ( Civ Engg )

Secretary

Shbi C. K. Bbbabta
Senior Deputy Director ( Civ Engg ), ISI

Domestic and Mxmicipal Water Fittings Subconaanittee, BDC 3 : 2

Members
Hydbaitlio Ekqinesb Municipal Corporation of Greater Bombay,

Bombay
DBFTirtY Hydbaxtlio Enoinbsb
( Alternate )
S^i Yash Raj Aooabwal Goverdhan Das P. A., Calcutta

"Shbi Jogindsb Raj Aooabwal
{Alternate)
Chibp ENOuncEtB Bangalore Water Supply Sewerage Board,

Bangalore
Chibp Ekoxnbbb Tamil Nadu Water Supply & Drainage Board,

Madras
Chiep Ekoinbbb Public Health Engineering Department,

Grovemment of Kerala, Trivandrum
Chibp EhoiKbeb U, P. Jal Nigam, Lucknow

SxTPBBiNTBMDiKa Ei^GiKEiBB ( Alternate )
DxBKOTOB Maharashtra Engineering Research Institute,

Nasik
Rbsbaboh Oppioes ( Alternate )
ShbiJ. D.'Cbuz Municipal Corporation of Delhi, Delhi

Shbi S. A. Swavy {Alternate)

{ Continued on page 13 )

IS 1 781 . 1984

Indian Standard

SPECIFICATION FOR CAST COPPER ALLOY

SCREW DOWN BIB TAPS AND STOP

VALVES FOR WATER SERVICES

( Third Revision )

0. FOREWORD

0.1 This Indian Standard ( Third Revision ) was adopted by the Indian
Standards Institution on 28 Scptmber 1984, after the draft finalized by
the Sanitary Appliances and Water Fittings Sectional Committee had
been approved by the Civil Engineering Division Council.

0.2 This standard was first issued in 1959 and subsequently revised in
1967 and 1977. The third revision of this standard has been taken up to
incorporate changes in the light of comments received from users and
manufacturers. The scope of the standard has been enlarged to permit
bib taps have internal and external ends. Similarly, stop valves shall have
either or both ends, namely male or female or mixed ends.

0.3 For the purpose of deciding whether a particular requirement of this
standard is complied with, the final value, observed or calculated,
expressing the resvdt of a test or analysis, shall be rounded off in
accordance with IS : 2-1960*. The number of significant places retained
in the rounded off value should be the same as that of the specified value
in this standard.

1. SCOPE

1.1 This standard covers requirements of copper alloy screw down bib
taps and stop valves suitable for cold non-shock working pressure up to
1-0 MPa. Bib taps shall have screwed male inlet. Stop valves shall have
screwed female ends or male ends or mixed ends ( mixed ends means one
end screwed male and the other end screwed female ).

Note — Cold service means a texpperature not exceeding 45''C.

•Rules for rounding off numerical values ( revised ).

IS : 781 . 1984

2. TERMINOLOGY

2.0 For the purpose of this standard, the following definitions shall apply.

2.1 Bib Tap — A draw-off tap with hori:^ontal inlet and free outlet.

2.2 Stop Valve — A valve with suitable means of connection for insertion
in a pipe line for controlling or stopping flow.

2.3 Screw-Down Bib Tap or Stop Valve — A bib tap or a stop valve
closed by means of disc carrying a renewable non-metallic washer which
shuts against the water pressure on a seating at right angles to the axis of
the threaded spindle wluch operates it.

3. NOMINAL SIZES

3.1 The nominal sizes of bib taps shaU be 8, 10, 15, 20 and 25 mm.

3.2 The nominal sizes of stop valves shall be 8, 10, 15, 20, 25, 32, 40 and

50 mm.

3.3 Nominal sizes of the bib tap and stop valves shall be designated by
the nominal bore of the socket or pipe outlet to which the tap or valve is
normally fitted.

4. MATERIAL

4.1 The material used for the manufacture of diflTercnt components of bib
taps and stop valves shall conform to the requirements given in Table 1 .

5. DIME^ISIONS AND TOLERANCES

5.1 Dimensions of bib taps and stop valves and their components shall be
in accordance with Table 2.

5.2 The overall length of stop valves shall be as given below with a
tolerance of ±3 mm.

Nominal Size

Overall Length, mm

Internally
Thrcadec

Externally
Threaded

Mixed Ends

100

125

105

100

135

115

110

145

125

135

175

155

tS : 781 . 1984

TABLE 1

MATERIALS FOR COMPONENTS OF BIB TAPS
AND STOP VALVES

Sl
No.

(I)

Component

(2)
Body and bonnet

( Claused A )
Matebial

(3)
a) Cast brass

Confoeminq to Indian Standaed

(4)

ii) Spindle, nuts

ill) Gland, crutch

( handle ) washer
plate, etc

Grade 3 of IS: 292-1961*
Grade DCB 2 of IS : 1264-198lt
b) Leaded in tin Grade LTB 2 of IS ; 318-1981+
bronze

Brass ( extruded, Type I half hard of IS : 319-1974§
rolled or forged ) Grade CuZn 42 pb 2 of IS ; 3488-
198011
Grade HT 1 of IS : 320-1980«[
Grade FHTB 1 of IS : 6912-*'*

Brass ( extruded. Type I half hard of IS : 3l9-1974§
roiled, cast, die Grade DCB 2 of IS : i264-i981t
cast ) Grade CuZn 42 pb 2 of IS : 3488-

198011
Grade 3 of IS: 292-1961*
Grade HT 1 of IS : 320-19801f
Leaded tin, bronze Grade LTB 2 of IS : 318-1981t

iv) Washer

specified in
: 4346-1982tt

♦Specification for brass ingots and casting (first revision ).

tSpecification for brass ingots die castings, brass gravity die castings ( including
noval brass ) ( second revision ) .

^Specification for leaded tin bronze ingots and castings ( second revision ).

§Specification for free-cutting brass bars, rods and sections ( third revision ).

nSpecification for brass bars, rods and sections suitable for forging {first revision ),

i[Specification for high tensile brass rods and sections ( other than forging stock )
( second revision ) ,

**Specification for copper and copper alloys forgings ( under preparation ).

tfSpecification for washers for water taps for cold water servicf^s.

.. — I

-' - .;. i t ^' ' .

6. CONSTRUCTION AND WORKMANSHIP

6.1 All castings shall be sound and free from laps, blow holes and pitting,
and both external and internal surfaces shall be clean, smooth and free
from sand.

6.2 The bodies, bonnets, spindle and other parts shall be machined so
that when assembled, the parts shall be axial, parallel and cylindrical with
surfaces smoothly finished within the limits of dimensions specified for
various oom.ponents. Bonnet may be located with the body with the help
of locking screw if desired by the purchaser.

IS : 781 - 1984

6.3 The wall thickness at any point of the body shall not be less than the
thickness D specified in Table 2. However, the minimum value of Z) may,
in the case of open end outlet of bib taps, be reduced by 0*40 mm. Bib
taps and stop-valves shall be designed and manufactured to tolerances set
to allow for interchangeability between units of same size of the same
manufacturer,

6.4 The seating of a bib tap or stop valve shall be solid with the body
and shall have a smooth machined surface. The edges shall be rounded
off to avoid cutting edges.

6«3 Bib taps shall be constructed as to ensure that the stream of water
shall not unduly break or spread.

6.6 Screw Threads

6.6.1 The inlet and outlet connection threads shall have internal or
external threads conforming to IS : 554-1975*. External parallel thread
shall conform to IS : 2643 ( Parts 1 to 3 )-1975t.

6i6^2 Bonnet threads shall be adequate to withstand minimum cold
working pressure. Minimum pitch of threads shall be 1*5 mm. The
internal thread in the bonnet for spindle shall be so formed that when the
spindle is screwed into the bonnet to its fully open position the ends of the
spindle projects beyond the face of the bonnet jby at least 0*7 mm in the
taps or valves up to 25 mm size, and by at least 1*5 mm in large sizes.

6.6.3 The threads on spindles shall be of square, ACME or V-form.
The length of spindle thread shall be such that when the washer plate is
resting on the seating without any washer, a length of the thread equal to
not less than three-fourths of the external diameter of the threaded portion
of the spindle shall be in full engagement with the internal thread of the
bonnet.

6.7 Body and Bonnet

6.7.1 The minimum bore of ends not threaded shall be according to
dimension ' K ' given in Table 2.

6.8 Washer Plate and Washer

6.8.1 The washer plate with its stem shall be either made in one piece
from cast brass or in two p^ieces from extruded or forged brass rods and
shall be machined all over.

♦Specification for dimensions for pipe threads where pressure tight joints are
required on the threads ( second revision ) .

tSpecification for dimensions for pipe threads for fastening purposes:
Part I Basic profile and dimensions {first revision ).
Part 2 Tolerances {first revision ).
Part 3 Limits of sizes {first revision ).

18:781.1984

TABLE 2 DIMENSIONS AND TOLERANCES OF BIB TAPS AND STOP VALVES AND THEIR COMPONENTS

{Clause 5A)

BIB TAP

EXTERNALLY THREADED
STOP VALVE

ts-J kp^ Us-
— OVERALt LENGTH ►

INTERNALLY THREADED
STOP VALVE

All dimensions in millimetres.

Dimensions

A
Min

Min

C
Min

Min

16-5

E
Min

F
Min

Min

H
Min

J
Min

Min

P
+ 0*0-
-0*5

Min

S
Min

Min

U
Min

V
Min

W
Min

List op Wa-
SHBR Plate

( WITH

Washxb in
Position,

Min)

Nominal

Sizes

47-8

13-3

7-8

6-3

2*0

7*9

7-0

3*8

10*0

M20

1*5

14*3

2*8

6-5

2-4

11*0

4*7

1*6

15*2

19*5

3*5

54-0

14-0

9-4

18-7

7-5

2*0

9*5

9-5

4*7

11*5

M20

X
1-5

15*9

3*2

9*0

3*2

11*4

7-9

2*0

20-8

23-3
28-3

54-0

14-0

9'4

19-0

7-5

2*0
2*5

9-5

11-0

5*6

11*5

M24

1-5

190

3*2

13*0

4*1

15*0

9-5

2*0

25*6

4*5

60-4

15-7

10-9

20-1

8-9

11*1

12-5

6*4

13-5

M30

1-5

25*4

4*0

18*0

4-9

16*3

10*3

2-0

305

330

10-5

66'8

18-0

12-5

230

10-1

2*5

12-7

13*0

7*1

17-0

M39

1-5

33*3

4*0

23*0

4*9

19*1

11*0

2.8

37*6

42-4

11*5

74-6

20-5

14-1

30-9

11-4

2-5

14-3

16*0

7*8

19-0

M48

1*5

401

4*3

5*9

21*4

12*7

3*2

47-2

52-1

13*5

9-5

B2'5

22-0

15-7

33-3

12-7

2'5

15*9

17-5

8*6

20-5

M56
X
1*5

47'7

5*5

6*6

21*4

14'3

3*2

56*4

58*5

13*5

95-0

25-3

17-3

35-9

14-0

2-5

17*4

17*5

12*5

26-0

M72
X
1*5

63-5

6*3

8*3

25*1

15*9

4-0

70*1

71-5

16-5

14*5

Note 1 — Length of thread R includes cut back under hexagon, if any.
Note 2 — The values of K are for core diameter.
Note 3 — The diameter of U and V are for face to face.
Note 4 — The dimension F is packing face.

As in the Original Standard, this Page is Intentionally Left Blank

IS : 781 . 1984

6.8.2 The washer plate with its stem in tap or valve shall be free to
rotate and slide in the hole of spindle.

6.8.3 Washer plate shall have a stud for attaching the washer. The
stud shall be threaded and provided with a nut.

6.9 There shall be sufficient distance between the underside of the handle
and the top of the bonnet when the tap or valve is closed, so as to provide
enough clearance for repacking the gland without removing the handle of
the bib tap or stop valve.

6.10 The handle shall be close fit on the spindle and it shall be fixed by a
screw, riveting or other equally eflfective device. The handle shall not be
screwed on to the spindle.

6.11 Gland Packing — The stuffing box of bib tap or stop valve shall be
packed with a suitable asbestos gland packing conforming to IS : 4687-
1980* or hemp/jute conforming to IS : 5414-1969t or other equally
efficient packing material suitable for both cold and hot water. A suitable
washer may also be fitted in the bottom of the gland or stuffing box,

6.12 A hexagonal shoulder shall be provided on the inlet end of taps and
both ends of stop valves. Square or hexagonal shoulders shall also be
provided on all bonnets. The dimensions across flats for both hexagonal
and square shoulder shall comply with as given in Table 2.

7. MINIMUM MASS

7.1 The minimum finished mass of the bib taps and stop-valves shall be as
given in Table 3.

8. FINISH

8.1 The bib taps shall be always polished bright.

8.2 The stop valves may be polished bright or they may have an
unpolished as * cast ' finish.

8.3 The bib taps or stop valves may also be nickel-chromium plated, the
thickness of plating shall not be less than service grade No. 2 of IS : 4827-
1968J. The plating shall be capable of taking high polish and shall not
easily tarnish or scale.

•Specification for gland packing asbestos {first revision ).

tSpecification for gland packing jute and hemp.

JSpecification for electroplated coatings of nickel and chromium on copper and

>Der allovs.

copper alloys

IS : 781 . 1984

TABLE 3

MINIMUM FINISHED MASS OF BIB TAPS AND STOP VALVES

(Clause 7 A )

Size

Minimum Finished Mass

Bib Taps

Stop Valves

. ,. 1. . . ^

Internally
threaded

Externally
threaded

.....^
Mixed end

(1)

(2)

(3)

(4)

(5)

0-250

0-220

0-250

0-235

0*300

0-300

0-350

0-325

0-400

0-330

0'400

0-365

0-750

0-675

0-750

0-710

1-250

M80

1-300

1-250

—

1-680

1-800

1-750

—

2-090

2-250

2-170

—

3-700

3-850

3-750

9. TESTING

9.1 Every bib tap or stop valve complete with its components shall be
tested under an internal hydraulic pressure of 2 MPa minimum
maintained at that pressure for a period of at least 2 minutes during
which it shall neither leak nor sweat.

10. SAMPLING

10.1 The scale of sampling and criteria for conformity shall be as given in
Appendix A.

11. MARKING

11.1 Every bib tap or stop valve shall be legibly marked with the manu-
facturer's name or trade-mark and nominal size on the body.

11.2 A direction arrow pointing in the direction of flow shall be cast or
stamped on the body of all stop valves,

11.3 The bib taps and stop valves may also be marked with the ISI
Certification Mark.

Note — The use of the ISI Certification Mark is governed by the provisions of
the Indian Standards Institution ( Certification Marks ) Act and the Rules and
Regulations made thereunder. The ISI Mark on products covered by an Indian
Standard conveys the assurance that they have been produced to comply with ^he
requirements of that standard under a well-defined system of inspection, testing and
quality control which is devised and supervised by ISI and operated by the
producer. ISI marked products are also continuously checked by ISI for conformity
to that standard as a further safeguard. Details of conditions, under which a licence
for the use of the ISI Certification Mark may be granted to manufacturers or
processors, may be obtained from the Indian Standards Institutiqn.

18:781-1984

APPENDIX A

( Clause 10.1 )

SAMPLING AND CRITERIA FOR CONFORMrTY
FOR ACCEPTANCE

A-1. SCALE OF SAMPLING

A-1.1 Lot — In any consignment, all the items ( bib taps or stop valves )
made of the same material, of the same nominal size and belonging to the
same batch of manufacture shall be grouped together to constitute a lot.

A-L2 For ascertaining conformity of the material to the requirements of
this specification, samples shall be tested from each lot separately.

A»1.3 The number of items to be selected from a lot shall depend upon the
size of the lot and shall be in accordance with col 1 and 2 of Table 4.

TABLE 4 SCALE OF SAMPLING AND CRITERIA FOR CONFORMITY

NtTMBBB OF ItEICS

IN THE Lot

(1)

Up to 150

151 to 300

301 „500

501 „ 1 000
1001 ,,3000
3 001 and above

A<-1.3.1 The ittms from the lot shall be selected at random. In order
to ensure the randomness of selection, procedures given in IS : 4905-1968*,
may be foUowed,

A.2. NUMBER OF TESTS AND CRITERIA FOR CONFORMITY

A-2.1 All the items selected according to col 1 and 2 of Table 4 shall be
examined for material, workmanship, construction, finish, dimensions and
minimum mass. An item failing in one or more of these requirements
shall be considered as defective.

A-2.1.1 The lot shall be considered as conforming to these requirements
if the number of defective items found in the sample is less than or equal
to corresponding acceptance number given in col 3 of Table 4.

♦Methods for random aanipling.

Sample

SiZB

Accept AN CK

NiTMBEB

SUB-SAKPIiB

Size

(2)

(3)

(4)

IS I 781 . 1984

A-2.2 The lot having satisfied the requirements ^ven in A-2.1 shall be
further tested for hydraulic pressure test as given in 9.1 of the specifica-
tion.

A-2.2.1 For this purpose, the number of items given in col 4 of Table 4
shall be selected from the lot. These may be selected from those which
have been examined for other requirements according to A-2.1 and found
satisfactory.

A-2.2.2 The lot shall be considered to have satisfied the requirement
for hydraulic test if none of the items in the sub-sample fails in hydraulic
test according to 9.1.

IS : 781 - 19M

( Continued from pag$ 2 )

Members Refnresenting

SitBi B, R. N. Gupta Engiaeer-in-Chief 's Branch, Army Headquarters,

New Delhi
Shbi K. V. Kbishkamubthy ( Alternate )
Shbi M. K. Jaih Hind Trading & Manufacturing Co Ltd,

New Delhi
Shbi K. K. Jaik ( AlUrnate )
Shbi S. R. Kshibsaoab National Enviornmental Engineering Research

Institute ( CSIR ), Nagpur
Shbi A. W. Dsshfakdb ( Alternate )
Shbi G. A. Ltthab Bombay Metal and Alloy Manufacturing Go Pvt

Ltd, Bombay
Shbi D. K. SbhoaIi Leader Engineering Works, Jalandhar

Shbi B. B. Sikka ( Alternate )
Shbi R, P. Sikka Sant Brass Metal Works, Jalandhar

Shbi K. Sujtnii Kuxab ( Alternate )
Shbi R. K. Somaky Hindustan Sanitaryware & Industries Ltd,

Bahadurgarh
Shbi R. K. Tandon Ministry ofRailways

Shbi T. N. Ubovbja Directorate General of Supplies & Disposals,

New Delhi

BUREAU OF INDIAN STANDARDS

Headquarters:

Manak Bhavan. 9 Bahadur Shah Zafar Marg, NEW DELHI 1 10002

Telephones: 331 01 31. 331 13 75 Telegrams: Manaksaristha

( Common to all Offices)

Regional Offices: Teiephone

Central : Manak Bhavan, 9 Bahadur Shah Zafar Marg, (331 01 31

NEW DELHI 110002 ?331 13 75

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CHANDIGARH 160036 I 3 16 41

r41 24 42
Southern : C, I. T. Campus, MADHAS 600113 V 41 25 19

141 29 16
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BOMBAY 400093

Branch Offices:

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AHMADABAD 380001 \ 2 63 49

JPeenya Industrial Area 1st Stage, Bangalore Tumkur Road (38 49 55

(^
BANGALORE 560058 ^38 49 56

Gangotri Complex, 5th Floor, Bhadbhada Road, T. T. Nagar, 6 67 16

BHOPAL 462003
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T.C- No. 14/1421. Ur.iversitv P.O.. Palayam /6 21 04

TRIVANDRUM 6J5035 \6 21 17
Inspection Offices ( With Sale Point ):

Pushpanjali, First Floor, 205-A West High Court Road, 2 51 71

Shankar Nagar Square, NAGPUR 440010
Institution of Engineers ( India ) Building, .1 332 Shivaji Nagar, 5 24 35

PUNE 411005

*Sales Office in Calcutta is at 5 Chowringhee Approach, P. O. Princep 27 68 00
Street. Calcutta 700072

fSales Office in Bombay is at Novelty Chambers* Grant Road, 89 65 28
Bombay 400007

JSales Office in Bangalore is at Unity Building, Narasimharaja Square, 22 36 71
Bangalore 560002

Reprography Unit, BIS, New Delhi, India

AMENDMENT NO. 1 OCTOBER 1988

IS : 781-1984 SPECIFICATION FOR CAST COPPER

ALLOY SCREW DOWN BIB TAPS AND STOP

VALVES FOR WATER SERVICES

/ Third Rei^ision J

{ Page 3, clause 0.2, third sentence ) — Delete,

[Page 5, Table 1, SZ jVb. (i), ^o/ 3 ] — Substitute ' (b) Leaded tir.
bronze for '(b) Leaded in tin broaze *.

( Pog^ 6, clause 6.3, line 2 ) — Substitute *T*for 'D\

( Page 6, clause 6.6.3. Line 4 ) — Substitute * two-thirds'' for ' threc-
fourths*.

{ Page 6, clause 6.7.1, line 2 ) — Substitute 'F for 'K\

( Pcge 7, TabU 2 ) — Delete the legend ' OVERALL LENGTH * from
the figiu'c for bib tap.

( Page 7, Table 2, Dimension L ) — Delete ' Min \

( Page 7, Table 2, last column heading ) — Substitute * Lift * for ' List \

( Page 7, Table 2, ^o/<r 2 ) — Substitute ' /Tand d^or ' /T \

( Page 7, Tflii^ 2, ^o/« 4 ) —

a) Substitute ' »pace '/or ' face '.

b) Add the following notes after Note 4:

* NoTX b-— The dimeasion H is length of body thread.

NoTK 6 — The dimeosion J is diameter of stem of washer plate. *

( Page 9, clauses 7 and 7.1 ) — Delete and renumber the subsequcni
clauses.

{ Page iO, Table 3 ) — Delete.

( Page 10, clause 9.1, line 2 ) — Substitute ' 1*5 MPa ' for ' 2 MPa \

( Page 11, clause A-1.3, line 2 an^ TaZt/tf 4 ) — Substitute ' Table 3 '
for ' Table 4 '.

(BDC3)

Reprography Ualt, BIS, Kew Deihi, ixidia

AMENDMENT NO. 2 NOVEMBER 1994

IS 781 : 1984 SPECIFICATION FOR CAST COPPER

ALLOY SCREW DOWN BIB TAPS AND STOP VALVES

FOR WATER SERVICES

( Third Revision )

( Page 10, clause 9.1 ( see also Amendment No, 1 ) ] — Substitute the
following for the existing:

'Every bib lap and stop valve complete with its components shall be tested in
closed position under an hydraulic pressure of 1.5 MPa (minimum) maintained at
that pressure for a period of at least 2 minutes during which it shall neither leak

nor sweat.'

( CED 3 )

Reprography Unit, BIS, New Delhi, India

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